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    Engine Revs up and down at 35 to 40 mph

    Here's my scenario. 2004 GMC Yukon Denali 6.0 AWD... I bought this back in February with 177k miles and noticed it had some issues (no big deal. Knew that when I bought it). Had a troublesome P0300 but we seemed to have calmed that down to the point where the CEL hasn't come back on and the...
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